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Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2026
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Expense
Stock-based compensation expense is included in the unaudited condensed consolidated statements of operations as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2026202520262025
Cost of product revenue$32 $16 $141 $134 
Research and development 596 675 1,710 2,064 
Selling, general and administrative920 1,822 2,708 5,226 
Total$1,548 $2,513 $4,559 $7,424 
Stock-Based Compensation Expense by Security Types
The following table presents total stock-based compensation expense by security type included in the unaudited condensed consolidated statements of operations (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2026202520262025
Stock options$1,087 $1,455 $2,723 $4,289 
Restricted stock units (“RSUs”) and RSAs385 950 1,578 2,805 
ESPP76 108 258 330 
Total$1,548 $2,513 $4,559 $7,424